* Artist to composer
* Composer to artist
Don’t allow setting the url for m4a files, since newer version of iTunes don’t like it
Since we are using AVfoundation use NSStrings constraints
Add a warning if using NSZombieEnabled
Since we are using AVfoundation use NSStrings constraints
Store the url of the file and its filetype + make the remaining vars strong for consistency
Implement the new properties
on 10.9 install_name_tool seem to need sudo
new mp4 property
Methods to use AVFoundation
Title,  disc#,  track#  done
mp3 cover need reworking
updated project settings for 10.9
Reading all tags
AVFoundation Does not using ----:
Setters for most fields
Remove taglib usage
ui chnages
remove field
mp4 Sort Fields